Would the factory marking be an "A" at the end of the serial number? The reason is this one has a serial number of 255xxA. The x's are actually numbers. I just didn't want to give the full serial number out. I actually think this one is factory drilled and tapped. But the serial number is before the 31k range as listed above. But I read elsewhere that an A on the end denotes a change and in this case a swooped bolt handle And drilled and tapped.
